Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 07 Mar 2014, 05:39

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# If a car travels with a speed of 40 miles per hour for first

Author Message
TAGS:
Senior Manager
Joined: 20 Feb 2007
Posts: 265
Followers: 1

Kudos [?]: 2 [0], given: 0

If a car travels with a speed of 40 miles per hour for first [#permalink]  14 Mar 2007, 02:05
If a car travels with a speed of 40 miles per hour for first 6 hours, and then 60 miles per hour for each additional hour. If during this whole journey it's average speed was 55 miles per hour, how many hours did it travel?
Director
Joined: 05 Feb 2006
Posts: 905
Followers: 1

Kudos [?]: 22 [0], given: 0

(40*6+60*x)/x+6=55
240+60x=55x+330
5x=90
x=18

6+18=24
Senior Manager
Joined: 20 Feb 2007
Posts: 265
Followers: 1

Kudos [?]: 2 [0], given: 0

Oh....I don't know how I could not see it!

Somehow I wrote it 240+60x=55+330 and got it all wrong.....
Senior Manager
Joined: 20 Feb 2007
Posts: 265
Followers: 1

Kudos [?]: 2 [0], given: 0

I realized now my mistakes are limited to some silly stuff, solving the Qs correctly but being careless to write all the equations properly.....I must be very vary careful
Similar topics Replies Last post
Similar
Topics:
The average speed of a car decreased by 3 miles per hour 3 08 Jan 2005, 13:37
At a speed of 50 miles per hour, a certain car uses 1 gallon 3 12 Nov 2006, 04:28
The average speed of a car decreased by 3 miles per hour 5 05 Mar 2007, 06:59
2 At a speed of 50 miles per hour, a certain car uses 1 gallon 4 31 Jul 2006, 07:16
3 A cyclist travels 20 miles at a speed of 15 miles per hour. 4 08 Jul 2012, 00:58
Display posts from previous: Sort by